Nver2loud

Here is a new one I have never seen a problem on, natural that I would have this problem though. Drove my car to work today for the first time in forever, went to lunch all was fine. Come back out and start the car and when the dinging starts after you start the car up, it almost sounded like a blown speaker for the dinger, but now it like sounds like scratchy all the time. It does it even when the car isnt on! Has no effect on rev's, turning or anything it does it randomly all the time, sometimes constant sometimes it stops for a few seconds. It is actually vibrating the dash a bit from what seems to be right behind where the heads up controls would mount to.
Any ideas??

byronhunter

That's where the Speaker is mounted. It's probably gone bad just like a speaker for the radio can go bad. So, I think you already diagnosed the problem.

Bill Curlee

Heres a few post for you:


- C5 Gage Cluster disassembly - http://forums.corvetteforum.com/c5-t...post1570380674

- C5 Gage Cluster Post - http://forums.corvetteforum.com/c5-t...post1570380878

Nver2loud

Ok, but its not just doing it during the dinging, its doing it ALL the time...even when the car is off, you walk away from the car and its still making noise. It vaguely sounds like trying to tune in a bad radio station.

Bill Curlee

Sounds like the speaker driver in the IPC is NOT happy. Try this: (grasping at straws)

Disconnect the battery NEG lead for a few min. Reconnect and see if theres a difference. When you reconnect the battery,,,make sure that you clear ALL the DTCs that sometimes appear when the BATT IS DISCONNECTED/RECONNECTED.

BC

byronhunter

Now we need a schematic of the IPC. Not availible, I don't think. We know there is one somewhere in the world, but where is the problem. Maybe Evil Twin knows someone up HIGH???? Some times it's not what you know, but WHO you know.


Maybe Never Too Loud played his Chime Too Loud.

Nver2loud

Ha, i wish that were the case, then I would be able to just replace the speaker Obviously there is something wrong with possibly the driver like Bill said. I will have to see if i can get out in the garage tonight to try that. It does it whether or not the car is running so i just gotta flick the ignition on and it will do it.

Nver2loud

Ok, so i have tried bill's idea of pulling the cable from the battery with no luck. I sat in the garage with the car off, ignition on and it was very quiet in the garage until i turned the ignition on and then the cluster started going nuts with noises. It doesnt really stop, it just gets quieter, until you hit a button or something and then it starts getting really loud again. So nobody has really had this problem huh?

Nver2loud

TTT... anybody????

Nver2loud

Ideas? For the time being I disconnected the speaker

Bill Curlee

Ok,,grasking at straws but,,,try this:

The IPC is serial data buss connected. The LDCM & RDCM and SCM can effect the IPC operation if the serial data wire in thoose modules gets corrupt. (Seen it numerous times before.)

Next to the BCM are TWO thin gray connectors. These are the STAR Class II serial data buss terminals. On one of the terminal connectors you will have FOUR wires. Those are the serial data wires for the LDCM & RDCM and SCM .

The top of that connector is a shorting buss and pops off. Once its off,,it will isolate those modules from the other modules. Isolate those modules (LDCM & RDCM and SCM ) by removing the top and see if the problem clears up. If not let me know and I will dig a little deeper.

Nver2loud

Alright Bill, I finally got around to removing the cluster to hook the speaker back up (newborns do that to you...) I disconnected the "star" connector completely and the cluster still makes noise. Obviously nothing works in either door at this point. I am fairly good at diagnosing items, but at this point im shooting strictly to a cluster problem but i hate to just pin the needle on that already...

Bill Curlee

Theres a high voltage power supply in the cluster for the florescent black lights. Disconnect that power supply and see if the noise goes away. A guy in England failed his inspection due to the car emitting excessive EMI RFI. Thats what was causing his issue.

BC

Nver2loud

Would this just be the green plug?

Bill Curlee

YES.. Heres a post for you that I found very interesting:

-- http://forums.corvetteforum.com/c5-t...post1570380674

Correct post UP-DATED

Nver2loud

Was this the right post? I have read through this post at one time, but do not recall anything because related to the cluster? I have done a few things to try to isolate the noise tonight. I have disconnected the flourescent transformer behind the cluster. The speaker was still making odd nosies so i disconnected the 2 white plugs on the transformer as well. The noise seemed to go away for a bit so I started the car and let it run for a bit. Granted its almost impossible to hear anything while the car is running in the garage (B&B Bullets w/longtubes) I still didnt hear anything. I thought all was fixed until I put the 2 nuts on the steering column and started to bolt up the column I heard a faint noise starting up. I turned on the ignition again without the car running and here comes the noise again....Im about to pull my hair out at this point. Im guessing it has to be a cluster problem of some kind?

Bill Curlee

I posted the wrong post. Its fixed and now has the correct one.

Bill Curlee

I'm not giving up. Try this:

Look where the speaker connects to the circuit board. Follow the circuit traces back and see what components it connects to. Look for poor solder joints and maybe you can find some common component with part numbers on it like an IC chip. Use a magnifying glass or a Lupe to inspect the board. The IC Amp that feeds the speaker could be going bad.

BC

Nver2loud

When I get more time I will have to dig into it deeper. I cant really swap my cluster, or even the board because the same board that would have the speaker amp also stores the mileage, etc.

Nver2loud

This must be a tri layer board...I have it out and the traces are inside the board and you cannot follow them. Now im lost...